Cisco: OSPF Authentication
Sumber: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13697-25.html
These are the three different types of authentication supported by OSPF.
- Null Authentication—This is also called Type 0 and it means no authentication information is included in the packet header. It is the default.
- Plain Text Authentication—This is also called Type 1 and it uses simple clear-text passwords.
- MD5 Authentication—This is also called Type 2 and it uses MD5 cryptographic passwords.
Plan Text Authentication
interface Loopback0 ip address 70.70.70.70 255.255.255.255 ! interface Serial0 ip address 192.16.64.2 255.255.255.0 ip ospf authentication-key c1$c0 !--- The Key value is set as "c1$c0 ". !--- It is the password that is sent across the network.
clockrate 64000 ! router ospf 10 log-adjacency-changes network 70.0.0.0 0.255.255.255 area 0 network 192.16.64.0 0.0.0.255 area 0 area 0 authentication !--- Plain text authentication is enabled for !--- all interfaces in Area 0.
MD5 Authentication
interface Loopback0 ip address 70.70.70.70 255.255.255.255 ! interface Serial0 ip address 192.16.64.2 255.255.255.0 ip ospf message-digest-key 1 md5 c1$c0 !--- Message digest key with ID "1" and !--- Key value (password) is set as "c1$c0 ".
clockrate 64000 ! router ospf 10 network 192.16.64.0 0.0.0.255 area 0 network 70.0.0.0 0.255.255.255 area 0 area 0 authentication message-digest !--- MD5 authentication is enabled for !--- all interfaces in Area 0.